Cellulose acetate semipermeable membrane and process for producing the cellulose acetate semipermeable membrane
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United States of America Patent
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Apr 16, 2002
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N/A
app pub date -
Apr 5, 2000
filing date -
Aug 11, 1998
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Abstract
To provide a cellulose acetate semipermeable membrane having a high filtration rate and high mechanical strength and which is hardly degraded by microorganisms, the present invention provides a cellulose acetate semipermeable membrane containing a cellulose acetate having an .alpha.-cellulose content of not less than 99% by weight, a 6 wt/vol % viscosity of 20 to 220 mPa.multidot.s at 25.+-.1.degree. C. and an acetylation degree of 58 to 62%. The cellulose acetate semipermeable membrane is suitable particularly as a hollow fiber membrane.
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